Malicious PDF — malware analysis report

Static analysis result for SHA-256 4270d6ba43abee42…

MALICIOUS

PDF

82.2 KB Created: 2021-02-27 19:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85764dceb61bd675b1d4985ba0c92bdd SHA-1: 24941d1c1723c264864aa3f57626111144717d48 SHA-256: 4270d6ba43abee42388045f65bccb552f8f9a6ea13e1a4728f2debf5ae873184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a primary focus on directing the user to 'vilenefex.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to wealth, suggesting a lure to a scam or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=top+1+percent+net+worth+2020 PDF link annotation
    • http://tufofol.medianewsonline.com/2003_dodge_durango_electrical_problems.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/88275423161.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/nq_mobile_vault_premium_cracked_apk_download7hakg.pdfIn PDF document text
    • http://marafonsport.site/58485071274fyc89.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/php_html_file_to_string.pdfIn PDF document text
    • http://disclosures.space/51994156878c7zeq.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/jebak_rupasaretun_godaw.pdfIn PDF document text
    • http://pelistens.xyz/freud_introductory_lectures_on_psychdmr38.pdfIn PDF document text
    • http://vonowaz.iblogger.org/nikon_speedlight_sb-600_troubleshooting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/casterton_college_rutland_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/searchs_for_text.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/senatevel.pdfIn PDF document text
    • http://zifixatef.rf.gd/jozagimoxelorugarimelez.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/tinuxunewo.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/98531446736.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 4708 bytes
SHA-256: a049a34e5acce3f91ff2c45e98c3bfe20ae41791451f893ece55d72a1ae679c4
font_01_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 11512 bytes
SHA-256: a81241a7c41b562d8a96f7cba78802b5eaaede4b77414da95bd36ab9ce648c15
font_02_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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